      <button onclick="addSection();">
        <div style="background-image: url('src/img/opt-section.png');">
        
        </div>
        <span>
          Book Section
        </span>
      </button>
      
      <button onclick="addWiFi();">
        <div style="background-image: url('src/img/opt-wifi.png');">
        
        </div>
        <span>
          WiFI Router
        </span>
      </button>
      
      <button onclick="addPOI();">
        <div style="background-image: url('src/img/opt-poi.png');">
        
        </div>
        <span>
          Point of Interest
        </span>
      </button>
      
      <button class="btn-bottom">
        <div style="background-image: url('src/img/opt-noti.png');">
        
        </div>
        <span>
          Notification
        </span>
      </button>
      
      <button class="btn-bottom">
        <div style="background-image: url('src/img/opt-find.png');">
        
        </div>
        <span>
          Find...
        </span>
      </button>
      
      <button>
        <div style="background-image: url('src/img/opt-zoin.png');">
        
        </div>
        <span>
          Zoom In
        </span>
      </button>

      <button>
        <div style="background-image: url('src/img/opt-zout.png');">
        
        </div>
        <span>
          Zoom Out
        </span>
      </button>